Gulewitsch 2013.

Study characteristics
Methods	RCT. 2 arms. Assessed pretreatment, post‐treatment (3 months)
Participants	End of treatment: n = 37 Start of treatment: n = 38 Sex: 24 F, 14 M Mean age = 9.4 years (SD = 1.72) Source = adverts in local newspapers and paediatricians' offices Diagnosis = functional abdominal pain or irritable bowel syndrome Mean years of pain = 34.84 months (SD = 40.7)
Interventions	"Hypnotherapeutic therapy" (hypnotherapeutic and behavioural methods) "Wait‐list control group"
Outcomes	Primary pain outcome: mean pain intensity Primary disability outcome: Paediatric Pain Disability Index Primary depression outcome: none Primary anxiety outcome: none Mean pain intensity Number of days with AP Mean duration of pain episodes School absence Paediatric Pain Disability Index Parent report of Abdominal Pain Index Parent report of Paediatric Pain Disability Index KINDL child report (health‐related quality of life) KINDL parent report (health‐related quality of life)
Notes	COI: "The authors declare that they have no conflict of interest." Funding: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	"Families were randomly assigned following simple randomization procedures (computerized random number generator)" Comment: probably done
Allocation concealment (selection bias)	Unclear risk	No description found in text Comment: probably not done
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No description found in text Comment: probably not done
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Attrition was described; differences between completers and non‐completers were not described
Selective reporting (reporting bias)	Low risk	Data fully reported